Roger Federer was denied a chance to fight for his 100th title, by the young German, Alexander Zverev in the semi-finals of the ATP World Tour Finals (7-5,7-6).

Alexander Zverev underlined his burgeoning potential by defeating Roger Federer and Novak Djokovic in successive days to clinch the biggest title of his career at the ATP Finals.

Meanwhile, Backer also insisted his former ward, Djokovic will dominate men's singles season next year and pointed out the Serb is showcasing glimpses of his vintage self. "It's the biggest title I've won in my career", said Zverev, who already has three Masters titles to his name.

"How I played today, how I won it, for me, it's just wonderful".

This time when the opportunity arose at exactly the same point of the match he struck, Djokovic netting to drop serve for the first time at the tournament.

"He obviously analysed the match that I played with him a few days ago, told me a few things I had to do different".

The new champion fell to the floor in jubilation and was warmly congratulated on court by Djokovic, who later said: "I'm really happy for him".

Zverev is all set to finish the year as the fourth-ranked player behind Djokovic, Rafael Nadal and Federer. Finishing the year as number one, that was the goal coming into the indoor season.

"When you get out of this feeling of a little bit disappointment that you lost, [you can enjoy] all the positive things that I have to reflect on and also take from this season, especially the last six months, ' he added".

That win was itself a huge scalp for a player that has never gone beyond the quarterfinals at a Grand Slam, but here he went one better.

"Speaking of being young, hopefully I'll play many more years and I'll see you guys here in years to come".

It is very fearless for Sascha to ask someone like Lendl to join his coaching team.

Djokovic, victor of 35 of his last 37 matches during a dominant second half of the year which propelled him back to world number one, had not dropped serve all week and had faced only two break points in his four previous matches.

I think the time he had off earlier in the year rejuvenated him and made him realise how handsome tennis is and how much he still has to give.

Anderson won two titles (New York Open and Vienna Open) and reached the final at Wimbledon where he lost to Djokovic.